Floss can occasionally cause harm, with poor technique leading to damaged gums and teeth and also dislodging bad bacteria, which can lead to infections.
People who are highly sensitive react with intense itching that prompts scratching and can lead to infections.
All 10 salon beds harbored bacteria that could lead to infections.
The vaginal lining splits easily, too, which can lead to infections.
The Health Protection Agency said the "disgusting" habit – a common sight at many matches – could lead to infections being passed on.
Lassa fever belongs to the same family as Marburg and Ebola, two deadly viruses that lead to infections with fever, vomiting and, in worse case scenarios, haemorrhagic bleeding.
Without access to proper sanitary products, many women and girls use rags, newspaper and even mud, which can lead to infections.
It can also lead to infections, ulcers in the vaginal tract or difficulties in future childbirth, and has ended many marriages, according to Women's Dignity, a Tanzanian NGO.
"We're seeing more evidence of anal sex in cultures with a high value on technical virginity, and it often causes lacerations and microabrasions that can lead to infections," said Ms. Alexander of the American Social Health Association.
Deforestation and agricultural intensification also heightens malaria risk while ocean warming, driven by the vast amounts of heat being sucked up by the oceans, can cause toxic algal blooms that can lead to infections in humans.
Unpredictable and unsafe situations can mean that those who are on their periods could go several days without changing their form of protection, which can lead to infections or potentially fatal illnesses such as Toxic Shock Syndrome.
